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Engine-Codes – GMC – P101C 2015 GMC Sierra

P101C 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Quick Answer

The P101C diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Glow Plug Control Module Temperature Sensor 2 Circuit registering a high voltage. Common causes include Faulty glow plug control module temperature sensor, Corroded or damaged wiring connecting the sensor to the control module, Electrical issues such as a short circuit in the circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P101C 2015 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty glow plug control module temperature sensor, Corroded or damaged wiring connecting the sensor to the control module, Electrical issues such as a short circuit in the circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P101C 2015 GMC Sierra Description

The P101C diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Glow Plug Control Module Temperature Sensor 2 Circuit registering a high voltage. The glow plug control module is responsible for managing the glow plugs in a diesel engine, which are used to preheat the combustion chamber for easier starting in cold conditions. The temperature sensor in question monitors the module's temperature to ensure proper functioning. When the sensor detects a high voltage, it indicates an issue with the temperature sensor or the wiring connected to it.

OBDII Code P101C 2015 GMC Sierra - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage
P101C 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Common Causes of P101C 2015 GMC Sierra

  1. Faulty glow plug control module temperature sensor.
  2. Corroded or damaged wiring connecting the sensor to the control module.
  3. Electrical issues such as a short circuit in the circuit.
  4. Defective glow plug control module.

Symptoms of P101C 2015 GMC Sierra

  1. Long cranking times before the engine starts, particularly in cold weather.
  2. Engine misfires or rough idling.
  3. Decreased fuel efficiency.
  4. Check engine light illuminated on the dashboard.

How to Fix P101C 2015 GMC Sierra

  1. Begin by inspecting the wiring harness and connectors for any damage or corrosion. Repair or replace as necessary.
  2. Test the glow plug control module temperature sensor using a multimeter to check for proper resistance values.
  3. If the sensor is faulty, replace it with a new one according to manufacturer specifications.
  4. Clear the DTC from the vehicle's computer using an OBD-II scanner.
  5. Test the vehicle to ensure the issue has been resolved and that the glow plug system is functioning correctly.

Cost to Fix P101C 2015 GMC Sierra

The cost of repairing a P101C code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the parts required for this repair, such as a new temperature sensor or control module, could range from $50 to $200. Labor costs may add an additional $100 to $300, depending on the shop's hourly rates. Overall, the total repair cost could fall between $150 and $500. It's advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on your vehicle's specific needs.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P101C 2015 GMC Sierra Code

1. What does the OBDII code P101C mean on a 2015 GMC Sierra?

P101C indicates a "Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage" issue, meaning the sensor is reporting a voltage higher than expected.

2. What are the common symptoms of a P101C code in a 2015 GMC Sierra?

Symptoms may include an illuminated Check Engine Light, difficulty starting in cold weather, reduced engine performance, or irregular glow plug operation.

3. What causes the P101C code to appear on a 2015 GMC Sierra?

Possible causes include a faulty temperature sensor 2, damaged or corroded wiring, poor electrical connections, or a malfunctioning Glow Plug Control Module.

4. Can I drive my 2015 GMC Sierra with a P101C code?

While the vehicle may still be drivable, it's not recommended as the issue can affect cold starts and engine performance, potentially leading to further damage.

5. How do I diagnose a P101C code on a 2015 GMC Sierra?

Start by inspecting the temperature sensor 2, its wiring, and connectors for damage or corrosion. Use a multimeter to check voltage readings and ensure they are within the specified range.

6. How can the P101C code be fixed on a 2015 GMC Sierra?

Repairs may involve replacing the Glow Plug Control Module temperature sensor 2, repairing damaged wiring, cleaning corroded connections, or replacing the module itself.

7. What tools are needed to resolve a P101C code on a 2015 GMC Sierra?

You may need an OBDII scanner, a multimeter, basic hand tools, and possibly a wiring diagram for the Glow Plug Control Module circuit.

8. How much does it cost to fix a P101C code on a 2015 GMC Sierra?

Repair costs vary but can range from $100 to $500 depending on whether the issue is with the sensor, wiring, or the Glow Plug Control Module.

9. Can a bad Glow Plug Control Module cause a P101C code?

Yes, if the module is malfunctioning, it may send incorrect voltage signals, triggering the P101C code.

10. How can I prevent the P101C code from recurring on my 2015 GMC Sierra?

Regularly inspect and maintain the Glow Plug Control Module system, including sensors, wiring, and connectors, to ensure they remain in good condition.

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